When ftruncate() is used on a filesystem supporting sparse files,
space in the file is not actually allocated. Then, when the file
is mmap'd and libffi writes to the mapping, SIGBUS is thrown to
the calling application. Instead, always fully allocate the file
that will back writable maps.
- Add missing files for desktop platforms in generate-darwin-source-and-headers.py, and in the Xcode project.
- Add a static library target for macOS.
- Fix "implicit conversion loses integer precision" warnings for iOS mad macOS targets.
By using VM_FLAGS_OVERWRITE there is no need for speculatively
allocating on a page we just deallocated. This approach eliminates the
race-condition and gets rid of the retry logic.
It was here since the first commit c6dddbd (warning: huge diff) and
it wasn't defined by the configure script. It was probably used
manually during development.
A gcc compiled on musl does not define __gnu_linux__, it defines __linux__.
Only on glibc does __gnu_linux__ get defined, but both define __linux__, so
we should check for that instead.
With this patch, libffi works perfectly, and passes its testsuite entirely
on musl libc systems.
The open_temp_exec_file_dir function can create a temporary file without
file system accessible link. If the O_TMPFILE flag is not defined (old
Linux kernel or libc) the behavior is unchanged.
The open_temp_exec_file_name function now need a new argument "flags"
(like O_CLOEXEC) used for temporary file creation.
The O_TMPFILE flag allow temporary file creation without race condition.
This feature/fix prevent another process to access the (future)
executable file from the file system.
The O_CLOEXEC flag automatically close the temporary file for any
execve. This avoid transmitting (executable) file descriptor to a child
process.
This provides working closure support on iOS/ARM devices where
PROT_WRITE|PROT_EXEC is not permitted. The code passes basic
smoke tests, but requires further review.
This implements support for re-mapping a shared table of executable
trampolines directly in front of a writable configuration page, working
around PROT_WRITE restrictions for sandboxed applications on Apple's
iOS.
This implementation is for testing purposes; a proper allocator is still
necessary, and ARM-specific code needs to be moved out of
src/closures.c.
Ryan C. Underwood
Anthony Green
Jean-Luc Jumpertz
Joerg Sonnenberger
Ole André Vadla Ravnås
Berker Peksag
Kylie McClain
Russell Keith-Magee
Mickaël Salaün
Magnus Granberg
Zachary Waldowski
Zachary Waldowski
Makoto Kato
Landon Fuller
Anthony Green